Efficient Blue to Red Afterglow Tuning in a Binary Nanocomposite Plastic Film.

Yan Xia,Huase Ou,Zhanjun Li,Wanbin Li,Gang Han

doi:10.3390/nano8040260

Yan Xia, Huase Ou + Show 3 more

Open Access

https://doi.org/10.3390/nano8040260

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Abstract

Colorful spectra are important for the diverse applications of persistent phosphors. A color conversion concept is developed to obtain abundant persistent luminescence color by mining capacities of known persistent phosphors with the most efficient persistent properties. Here, SiO2/Sr2MgSi2O7:Eu,Dy nanoparticles are chosen as a blue persistent luminescence donor nanophosphor, while ultrafine CaAlSiN3:Eu is utilized as a red conversion phosphor to tune the persistent luminescence spectra from blue to red. The red afterglow emission can persist for more than 5 h. The decay of the red afterglow follows nearly the same kinetics as that of the blue one. Continuous color tuning can be successfully obtained by simply changing the mass ratio of the donor/conversion phosphor pair. This color conversion strategy may be significant in indicating numerous persistent/conversion nanocomposites or nanostructures and advance the development of persistent phosphors in diverse fields which need colorful spectral properties.

Highlights

The emission of persistent phosphors can persist for a long period after excitation ceases
Novel Cr/Ga-free persistent phosphors are being explored such as Zn3Ga2Ge2O10:Ni2+ [13], LaAlO3:Mn4+,Ge4+ [14], BaZrSi3O9: Eu2+, Pr3+ [15], KGaGeO4:Bi3+ [16], semiconducting polymer [17], metal organic framework [18]
Using nanophosphors may generate more efficient color conversion or energy transfer. Inspired by these previous works, we propose that persistent spectral tuning can be realized efficiently by exploring known persistent nanophosphors via color conversion

Summary

Introduction

The emission of persistent phosphors can persist for a long period after excitation ceases. There is still not a red persistent phosphor with afterglow properties close to the commercialized blue or green ones. A novel strategy is needed to realize efficient red persistent luminescence to facilitate the practical applications of persistent phosphors. The color conversion phosphors absorb part of the blue light and emit green, yellow, and/or red light to generate abundant visible colors [22,23,24,25]. Yuhua Wang’s group successfully introduced color conversion to generate white persistent luminescence by using CaAl2O4:Eu2+,Nd3+ bulk material as blue persistent phosphor and Y3Al5O12:Ce3+ as conversion phosphor [26]. Using nanophosphors may generate more efficient color conversion or energy transfer Inspired by these previous works, we propose that persistent spectral tuning can be realized efficiently by exploring known persistent nanophosphors via color conversion. The nanocomposite is buried into polymethyl methacrylate (PMMA) plastic film to make the particles stay close to each other and to ensure efficient conversion efficiency

Synthesis of SMS

Synthesis of CASN

Characterization

Results and Discussion